pragma solidity ^0.4.0;

interface ERC20 {

function totalSupply() external constant returns (uint _totalSupply);

function balanceOf(address _owner) external constant returns (uint balance);

function transfer(address _to, uint _value) external returns (bool success);

function transferFrom(address _from, address _to, uint _value) external returns (bool success);

function approve(address _spender, uint _value) external returns (bool success);

function allowance(address _owner, address _spender) external constant returns (uint remaining);

event Transfer(address indexed _from, address indexed _to, uint _value);

event Approval(address indexed _owner, address indexed _spender, uint _value);

}